Distribution valve for steam engines and the like



June 26, 1928. 1,675,305

c. w. DAKE DISTRIBUTION VALVE FOR STEAM ENGINES AND THE LIKE Filed Oct.15, 1926 3 SheetsSheet l INVEXNTOR (kW/4 Mide ATTORN EY June 26, 1928.

C. W, DAKE mswaxaunou VALVE FOR swm mamas AND THE LIKE 3 Sheets-Sheet 2Filed Oct. 15, 1926 INVENTOR flan ar/JJa/e ATTORNEY I v .l'

June 26, 1928. 1,675,305

c. w. DAKE DISTRIBUTION VALVE FOR STEM! ENGINES AND THE LIKE Filed 06b15, 1926 3 Swans-Sheet 5 Patented alune 25, "1923.

UlED STATES PATENT OFFICE.

CHARLES; BAKE OF CHICAGO, ILLINOIS, ASSIGNOR 'I O THE PYLE-NATIONAL COM-PANY, OF CHICAGO, ILLINOIS, A CORYOBATION OF NEW JERSEY.

ZI'ISTRLBUTION VALVE FDR STEAM ENGINES AND THE LIKE Application filedOctober 15 1923. Serial Ho 141.768.

Viv invention relules to improvements in mtiun v -1- for steam enginesand like and has p21; insular reference to What call-rd 22 duplex;valve. that is,--s valve wherein the time at which the major part of theWorking supply of steam is fed into the cylinder, is dill'erenl, fromthe time when a; certain. smaller part of the working supply is fed andwherein moving valve element in coo ierntion with the valve port accomnplishes this double time control. b

I. provide in connection with the moving valve element an auxiliaryportor passage ti'ile'fligjll tho valve seat ext nding behind the ciitoil, are of this valve. This small port or passage allows steam to rulerthe cvlinder rlrcr the main. 1 12 we pars has closed port" This ingeneral the t as a change in the valve ontrol, and it possible to startheavier loads and llfiflHQi loinis at low speeds than, 15 rho andbecomes iili'f rethsr inoperat c when the speeds are l h b came thelittle auxiliary port or I sage is so smell th' t id "l ails it exerts nneglinillle and nng liable effect TlllS n cs it possible i0 get the mostsatisfactory on; he operating conditions without the uni-e or long valvetravel or complicated valve gizsruzg. "lho :idvnnlngc or; climinating-;.im f Merl vulva gearing onvinus, the inlvsu of eliminating long Ilubricmion iliillcull' es bccon'ie a when the high 'l't. pistonzwguivcrl ll; permit long valve lrzivcl i'nvcnii-in s illu trated moreor less (Tlliiflfl'i'lllllfii .ll? in the n,ccoiiipairvmg- \lXZiWi rigs,wh in iiudinal section through rigors .l is n lit-2i" valve and sentcmsent n wallow ll'nough the vulve ld igrnre l u. similar to i hmvinqthe valve in if; opvn n:

lflwirc 5% 2 similar s lion :hi' '1! tin valve n cleval'ion in aniniernmlimc posh tiom like parts are indicated lav lik charactersthrough ut lhc specification and drawings A is a valve stem flanged at Aand having enlarggcitl bearing surfaces A adjacent the flange A and A.adjacent the end of the stem. A is a lock pin projecting from thebearing surface A. The rod A is reduced at A at the bearing surface A"and there threaded.

The two piston heads, there being one at each end adapted to it upon thebearing members A A comprise hubs B, spokes B, and flange rims B*. Theseheads are opposed as indicated with the flanges at the end of thepistons. The hubs B both having longitudinal keywnys B and one of thehubs B is cut away to engage the pin A where it seats upon the flange A.The kcyway of the other hub fits the pin A; thus the two hubs are heldagainst rotation with respect to the valve stem. Carried by the flangerims B are cylindrical working nicn'ibcrs B. These members located oneat either end of the valve, travel along and engage the valve cylinder,sleeve or bushings ll, Thcv are engaged alon their sides removed fromthe flange w eel by. conical tiller members B which in turn areseparated by the cylindrical valve body B. The nut B when screwed up onthe threaded and of the stem compresses the separate elements abovereferred to comprising thevalve against the flange A. and the pressureof the nut holds all the parts together.

The sleeves B are ported at C, these ports being adapted. to becontrolled by the working velve elements which are 50 disposed i; it therings C form the main cut off edges of the valve. The outer peripheriesof the members B contain other packing rings C I all of which are infrictional contact with tin: sleeves B and prevent steam leakage. (1 itport extending throughthe valve seat so (hut steam may pass from thespace surrounding the cylinder body B into the port and thence to theengine cylinder, even when the major portion of the ports are closed bythe working part of the piston. The boundary of the port C farthestremoved from the port (1 forms the auxiliary cut oil" edge oi" thovalve. The steam, of course, enters the valve cylinder in the directionshown by the 2 row X and the exhaust l aves it in he direction of thearrow Y in Figure 4. Tlw parts are hown with the mun: leading in theright hand end of the engine. cylinder complctcly cut ofi and thepassage C is closed. The ports leading to :he left hand end of theengine cylinder are slightly open for the commencement of the exhaust.In Figure 5, the exhaust is wider open, the port C is not yet open but asmall amount of steam is allowed to pass in through the passage C Thisgives an early opening for the steam. Further movement of the valvetoward the right would result in wider opening of the exhaust at theleft end and full opening of the steam passage at the right hand end. Asthe valve returns back toward the position shown in Figure 5, the steamwill be cut off but a small amount of steam will still pass in towardthe end of the stroke so that a small additional quantity of steam isallowed to enter at the two ends of the stroke when it is especiallyneeded at low speeds. Obviously if the speeds are great, the time duringwhich any steam will pass through the auxiliary passage is so slightthat the amount of steam which can pass in will be so slight inproportion to the amount of steam normally passing that the efiect ofthis auxiliary passage will be greatly minimized and to all practicalpurposes eliminated, but at low speeds when valve movement is relativelyslow the effect of this advance opening and retarded final closing ofthe steam supply will be to give a longer time during which steam is fedto the working end of the cylinder, thus enabling the engine to carryheavier loads at lower speeds.

I claim:

A distribution valve for steam engines comprising a piston havingenlarged ends, a ported valve bushing in which the piston reciprocates,packing rings in each enlarged lend traversing the ports, one of therings in each end forming a main cut off edge, channels one associatedwith each enlarged end, extending along the inner periphery of thebushing. from the ports in the direction which the piston travels to cutoff steam, the cut oil edge forming, packing ring being adapted totravel the length of the channel, and when it reaches the end thereof toact as an auxiliary cut off edge.

Signed at Chicago county of Cook and State of Illinois, this 13th day ofOctober, 1926.

CHARLES W. DAKE.

